Split sheet-metal pulley.



No. 878,602. PATENTED FEB. 11, 1908.

Q L. A; BIGGAR.

SPLIT SHEET METAL PULLEY.

APPLICATION FILED JULY 5, 1907.

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4 k-zf' rut Nomzls wnzns co. WASHINGION, n cy LEROY AYRES BIGGAR, OFONEIDA, NEW YORK.

SPLIT SHEET-METAL PULLEY.

Specification of Letters Patent.

Patented Feb. 1 1, 1908.

Application filed Julv 5. 1907- Serial No. 382,334-

To all whom it may concern:

Be it known that I, LEROY AYRES BIGGAR, of Oneida, in the county ofMadison, in the State of New York, have invented new and usefulImprovements in Split Sheet-Metal Pulleys, of which the following, takenin con nection with the accompanying drawings, is a full, clear, andexact description.

This invention relates to certain improve- 'ments in split sheet metalpulleys, the essential objects of which are lightness, economy inmanufacture, and durability. In this class of pulleys sheet metal spokesare employed to unite the rim to the hub, and one of the specificobjects of my present invention is to provide reinforcing elements atthe junction of the spokes with the hub, and also to brace the meetingedges of the rim. against radial compression, the outer ends of thespokes being also arranged to brace the rim in such manner as to relievein a measure, direct radial compression or end-thrust strains upon thespokes. i

In the drawings-Figure 1 is a side elevation, partly in section, of aportion of a split pulley embodying the various features of myinvention. Fig. 2 is an inner face view of one form of the pulley. Fig.3 is a side view, partly in section, of a portion of a modified form ofpulley, as used for smaller sizes. Fig. 4 is an inner face view ofone-half of the pulley seen in Fig. 3.

This pulley comprises essentially opposite half rim sections --1, asplit hub -2- divided in the plane of the meeting edges of the rimsection -1 and spoke-arms -3- of sheet metal which are'reinforced at thejunction with the hub by specific brace-bars 4.

Each rim section 1 preferably consists of a semi-circular sheet metalplate of any desired face width and having its opposite longitudinaledges rolled or turned inwardly forming reinforcing flanges -5 tostiffen the rim against undue bucking, and also serving to maintain thesemi-circular form of the rim.

The opposite ends of each rim section are bent inwardly toward eachother in the plane of the meeting edges of the sections forming flatradial flanges -6- having apertures 7 for receiving suitable clampingbolts 8, whereby the meeting ends of the rim sections may be clampedtogether.

The spoke-arms 3 preferably consist of V-shape sheet metal bars havingtheir apexes flattened or truncated and secured to the hub section byrivets -9-, together with suitable transverse reinforcing bars -10-which fit in the apexes of the arms 3 and are fastened in place by therivets 9- for the purpose of reinforcing the spoke-arms at theirjunctions with the hub.

The apex of the V-shape spoke-arms -3 is preferably concavo convex andof greater width circumferentially than the diameter of the bolts orrivets 9 so as to afford as broad a hearing as possible upon theperiphery of the hub while the reinforcing plates 10- are made toconform to the angle between the arms -3- in which angle they closelyfit so as to stiffen the corners at the apex of the spoke arms, and atthe same time, relieve in a measure, shearing strains upon the bolts 9.

' In the pulley shown in Fig. 1, each half section is provided with aseries of, in this instance, three V-shape spoke-arms, one at the centerbeing secured to the hub in the manner just described by the rivets -9-,while the others are of substantially the same construction, but arereinforced at their junction with the hub section by the braces 4-.

' The spoke-arms 3- nearest the meeting edges of the pulley section aredisposed at an angle with the plane of said meeting edges, while thebraces 4- which are secured to i the diametrically opposite spoke-armsat the meeting faces of the pulley are provided with outwardly extendingflanges 11- resting upon and secured to the adjacent spoke-arm -3- byrivets -12- while the inner ends of said brace-bars -4 are provided withflanges 13 resting in the apexes of the spoke-arms 3 and secured theretoand to the hub by rivets -14.

As shown in Fig. 1, the inner ends of the bracabars -4- are turnedinwardly toward the meeting faces of the pulley sections and theintermediate portions of said brace-bars are spaced apart some distancefrom the adjacent spoke-arm -3- at such meeting edges leaving anintervening space between the brace-bar and adjacent spoke-arm, a partof said intermediate portion of the brace bar being substantiallyparallel with the meeting faces of the pulley sections, and providedwith an aperture 16- for receiving clamping bolt 17 by which the pulleysections are clamped to the shaft, not shown, the object of makingcertain parts of the intermediate portions of the brace-bars 4 parallelbeing to afford suitable bearings for l the heads and nuts of theclamping bolts 17 so that in tightening the bolts the line of draftwould be at substantially right angles with said meeting faces of thepulley sections.

The adjacent sides of the V-shape spokearms converge outwardly from thehub toward each other and are secured together intermediate their endsby rivets 19-, their outer ends being divergent and provided withflanges 20 which fit against the inner side of and are secured to therim by rivets 21, as best seen in Fig. 1.

The arms 3- at the meeting edges of the pulley sections are securedtogether by clamping bolts 22, which together with the clamping bolts 8and 17, are readily removable to permit the pulley sections to beseparated;

The pulley shown in Figs. 3 and 4 has substantially the same elements asshown in Figs. 1 and 2, but is adapted for the smaller sizes, that is,each half section of the rim is united to the corresponding hub sectionby a series of in this instance, two V-shape spokearms 24, the apexes ofwhich are also concavo convex, but somewhat wider than those shown inFig. -1 and are seated upon the periphery of the hub section 2 andsecured thereto by rivets 25.

The spoke-arms 24 are reinforced at their junction with the hub sectionsby braces 26 which are similar to the braces -4, except that the flangeswhich are fitted in the apexes of the spoke-arms are turned outwardlyinstead of inwardly and are secured in place by the rivets 25.

A further difference of construction shown in Fig. 3 over that shown inFig. 1 is that the spoke-arms at the meeting edges of the pulleysections rest against and are clamped to the inturned flanges 6 byclamping bolts 8-, or in other words, the inturned flanges 6- at themeeting edges are clamped between the outer ends of the spoke-armsadjacent to the meeting faces of the pulley sections.

The object in spacing the intermediate portions of the braces 4- and 26apart from the adjacent portions of the spoke-arms to which they aresecured is to allow a limited resiliency of such parts under the strainsto which the spokes are subjected so as to distribute such strains fromthe spokes more directly onto the hub, or rather over a broader areacircumferentially around the hub, thereby preventing in a measure,crystallization of the parts due to vibration.

What I claim is:

1. In a split pulley, a sheet metal hub and a sheet metal rim incombination with V- shape spoke-arms having their apexes secured to thehub and their outer ends secured to the rim and braces having their in-,

ner ends seated in the apexes of the spokearms and their outer endssecured to the spoke-arms at the meeting faces of the split pulley. I

2. A split pulley comprising ahub section and a rim section, a series ofoutwardly diverging spoke-arms having their inner ends united andsecured to the hub section and their outer ends deflected inwardlytoward each other and secured to the rim section, and brace bars in theangle of the diverging spoke-arms and secured to the hub, and to theadjacent spoke-arms.

3. In a split pulley, a sheet metal rim and a hub in combination withsheet metal spokes having their inner ends concavo convex and seated onthe periphery of the hub and their outer ends deflected laterally andsecured to theinner face of the rim and brace-bars having their innerends seated upon the concave convex inner ends of the spokes and securedto the hub and their outer ends secured to the spokes, the intermediateportions of said brace bars being spaced apart from the adjacent portionof the spokes and disposed in planes substantially parallel with themeeting faces of the pulley sections, and clamping bolts passed throughthe intermediate portions of the brace-bars and adjacent spokes forsecuring the opposite pulley sections together.

In witness whereof I have hereunto set my hand this 29 day of June 1907.

LEROY AYRES BIGGAR. Witnesses:

CLARA B. WOOLWORTH, J AMES Moons.

